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  1. White Blood Cells: Types, Function & Normal Ranges - Cleveland Clinic

  2. Leukocytes in Urine: 3 Possible Causes - WebMD

  3. Leukocytes in Urine: What You Should Know - Healthline

  4. White blood cell - Wikipedia

  5. White Blood Cell Count: Normal, High, and Low Counts - Healthline

  6. White blood cells: Function, ranges, types, and more - Medical News Today

  7. Histology, White Blood Cell - StatPearls - NCBI Bookshelf

  8. White blood cell | Definition & Function | Britannica

  9. Types of White Blood Cells and Their Functions - Verywell Health

  10. What Are White Blood Cells? - Health Encyclopedia - University …